> mp: (mystery-person) a simple, cartoon-style silhouetted outline of a person (does not vary by email hash)
identicon: a geometric pattern based on an email hash
monsterid: a generated 'monster' with different colors, faces, etc
wavatar: generated faces with differing features and backgrounds
retro: awesome generated, 8-bit arcade-style pixelated faces
robohash: a generated robot with different colors, faces, etc
blank: a transparent PNG image (border added to HTML below for demonstration purposes)